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ARCADIS Ms. Kathy Amaru <br /> October 19, 2010 <br /> • TPH as motor oil by USEPA Method 8015B(M) <br /> • Naphthalene by USEPA Method 8260B <br /> Concentrations of analytes in groundwater were compared to RWQCB ESLs. <br /> Temporary Well Point Abandonment <br /> Upon completion of groundwater sampling, all pre-packed well materials were <br /> removed from the soil boring TW-01. The borehole was grouted from the total depth <br /> to ground surface using neat cement in accordance with the San Joaquin County <br /> Environmental Health Department(SJC-EHD) protocols. Gravel was applied at the <br /> surface to restore the site to prior conditions. <br /> Groundwater Analytical Results <br /> Concentrations of TPH as diesel were detected above the RWQCB ESL of 100 <br /> micrograms per liter(Ng/L) in the groundwater sample collected from TW-01 at a <br /> concentration of at 430 pg/L. TPH as gasoline, TPH as motor oil and Naphthalene <br /> were not detected above the laboratory detection limits of 100 pg/L, 500 pg/L, and 10 <br /> pg/L, respectively. <br /> Groundwater analytical results are presented in Table 2 and are also shown on <br /> Figure 3. The laboratory analytical report and chain-of-custody documentation are <br /> included as Appendix B. <br /> Waste Management <br /> Removed materials and investigation derived waste (IDW) generated during <br /> investigation activities included excavated soils, soil cuttings, decontamination fluids, <br /> purge water, personal protective equipment(PPE), and other disposable sampling <br /> materials. Excavated soils, soil cuttings derived from drilling, wastewater from <br /> decontamination procedures, and purge water from the collection of groundwater <br /> samples were placed into roll-off containers for offsite transportation and disposal. <br /> PPE, such as nitrile gloves and disposable supplies or other household-type waste, <br /> such as paper and plastic, was treated as municipal waste. Pending characterization, <br /> IDW was stored onsite in a secure and controlled area. Containerized waste was <br /> disposed of in accordance with waste hauler, waste handling facility and state and <br /> federal requirements. <br /> Page: <br /> 0111012775 E¢ 9/12 <br />